#page_wrap{
    position: absolute;
    width: 7.5rem;
    height: 100%;
    top: 0;
    left: 50%;
    transform: translate(-50%);
}
#absolute(@width:100%,@height:100%){
    position: absolute;
    width: @width;
    height: @height;
}

#absolute_center_middle(@width:100%, @height:100%){
    position: absolute;
    width: @width;
    height: @height;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

#absolute_center(@width:100%, @height:100%){
    position: absolute;
    width: @width;
    height: @height;
    left: 50%;
    transform: translate(-50%);
}

#relative_center(@width:100%, @height:100%,@top:0){
    position: relative;
    margin: @top auto ;
    width: @width;
    height: @height;
}

//背景路径
#bg_img(@url,@width:100%,@height:100%){
    background: url("../../static/img/@{url}");
    background-size:@width @height;
}
